Wow, thanks so much for all the input, everyone. I've decided to suck it up and keep the camera, and here's what was ultimately the deciding factor: I went back and looked at some photos my friend took a few months when he was showing us his D200. He's been shooting with it for a long time and, sure enough, there were two hot pixels in every photo he took. This guy does photography and graphics work for a living, and here he had hot pixels on his camera just like mine did. His camera isn't perfect, but it has clearly worked out just fine for him. So mine will probably be just fine for me.
I really appreciate all the information you guys have given me, and I just bought Aperture last week so I will be using that to do some easy touch-ups if the hot pixels really bother me. Or I can try Alan's method: shoot in RAW and open them up in ACR and see if they go away automatically